Patent US2802838A successfully refreshed from Google Patents.
US2802838A
Expired / Lapsed
US
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Tetrahydrofurfuryl-nu-methyl carbamate
Assignee: Spencer Chemical Co
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Filing: 1953-12-01
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Granted: 1957-08-13
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Expires: 1973-12-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Archie J Deutschman
- 👤 Willard C Bull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:34
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/10; C07D307/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
TETRAHYDROFURFURYL N-METHYL CARBAMATE HAVING A BOILING POINT OF 100*-105* C/2 MM. AND A MELTING POINT OF -70*C.
Claim 2
Dependent Claim
17 words
TETRAHYDROFURFURYL N-METHYL CARBAMATE HAVING A BOILING POINT OF 100*-105* C/2 MM. AND A MELTING POINT OF -70*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |